Page 311 - Aeronautical Engineer Data Book
P. 311
250
Always negative and hence Lateral static stability, determined by total dihedral effect. Most accessible approximate contribution is given Natural weathercock stability, dominated by
Comments stabilizing
�c y ydy s 0
1 F�
y B – F s 0 2C L t n 1 / 4 a – S h l F � 0 a h
S S �c y a y ydy s H F c h hdh
Table A3.2 Small perturbation derivatives referred to aircraft wind axes
S � B S 1 – s S a 1 F V F F � a 1 F V F � 1 – b S
Expression (i) wing with dihedral (ii) wing with aft sweep (iii) fin contribution (i) fin contribution (i) fin contribution
Description Sideforce due to sideslip Rolling moment due to sideslip Yawing moment due to sideslip Sideforce due to roll rate
Derivative Y v L v N v Y p
